Yes, you can continue having plantains during pregnancy. As per an article in the American Botanical Council, there is no harm in having plantains when you are expecting. Moreover, plantains are rich in dietary fiber which helps in digestion and relieves constipation. Hence, they can be a good addition to your pregnancy diet.

6 expert recommended foods to eat to reduce morning sickness
Morning sickness is the nauseous feeling commonly experienced during around the 6th to 12th weeks of pregnancy. It affects around 50% of all pregnancies. Although morning sickness is not harmful to you or your baby,